Postman makes API development faster, easier, and better. The free app is used by more than 3.5 million developers and 30,000 companies worldwide. Postman is designed with the developer in mind, and packed with features and options.

Postman features include:

Powerful, simple to use GUI

Saved history of API requests

Unlimited collections, environments, tests, and sharing

Automated testing with collection runner

Web-viewable, detailed API documentation

Flexible API monitoring, for uptime, performance, and accuracy

Mock servers, to support split-stack development

Note on Permissions:

The “Your data on all websites” permission is required to send a request to a domain. It's not used for anything else by Postman.